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Two green DDR4 SODIMM sticks with black chips no heat spreader

NEMIX RAM

NEMIX RAM 64GB (2x32GB) DDR4 2666 CL19 SODIMM for iMac 21.5" 2019 memory upgrade

SKU CH-Z47S-DG7W5

64 GB DDR4 SODIMM kit with two 32 GB modules at 2666 MHz CL19 for 21.5-inch 2019 iMac

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 64 GB kit doubles iMac 21.5" 2019 memory to maximum supported capacity
  • DDR4 2666 CL19 matches Apple factory speed and latency specifications
  • 20 V low-voltage modules reduce power draw and heat in slim all-in-one
  • 2Rx8 dual-rank organisation improves memory controller efficiency under load
  • Major OEM Samsung, Micron, Hynix chips validated for system stability

64 GB DDR4 2666 kit for iMac 21.5" 2019

This NEMIX RAM kit provides 64 GB of DDR4 2666 memory in two 32 GB SODIMM modules. It is built specifically for the Apple iMac with Retina 4K display 21.5-inch Early 2019. The modules run at 1.2 V with CL19 latency and use 260-pin unbuffered non-ECC chips.

Suits owners upgrading that iMac to 64 GB.

Buyers with the exact 2019 21.5-inch iMac model can install this kit to reach the maximum supported capacity. Systems that require ECC registered memory, a different pin count, a higher speed grade, or a different form factor cannot use these modules.

Deciding spec: 260-pin DDR4 SODIMM at 2666 MT/s

The 260-pin DDR4 SODIMM interface running at 2666 MT/s is the single specification that determines fit. If the target Mac accepts PC4-21300 unbuffered non-ECC SODIMMs at this speed and voltage, the kit will work; otherwise it will not seat or boot.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $323.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.06 per GB
Cheaper than about 76% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2666 MHz Non-ECC Unbuffered SODIMM
Part numberMS21300-328K2
Total capacity64 GB (2 × 32 GB)
Product type260-Pin DDR4 SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items64 GB (2 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

Does the 260-pin DDR4 SODIMM form factor fit the memory slots in the iMac 21.5" 2019?

Yes, the 260-pin DDR4 SODIMM modules match the slot type used in the iMac 21.5" 2019 for a direct installation.

Will the 1.2 V operating voltage of these modules work with the existing memory in the iMac 21.5" 2019?

The 1.2 V DDR4 voltage is the standard for the iMac 21.5" 2019, so the new modules run at the same voltage as the factory memory.

How can I confirm the iMac 21.5" 2019 recognises the full 64 GB after installing the kit?

Open About This Mac after installation; the Overview tab should display 64 GB of 2666 MHz DDR4 memory.

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